The structures, fences and walls that mark the border between the United States and Mexico as President Donald Trump reiterates his promise to build a wall along the U.S. border with Mexico.

Three men from India jump the fence from Mexico and give themselves up to U.S. border patrol agents in Calexico, California

He tweeted today: “The Wall is the Wall, it has never changed or evolved from the first day I conceived of it.

“Parts will be, of necessity, see through and it was never intended to be built in areas where there is natural protection such as mountains, wastelands or tough rivers or water.

“The Wall will be paid for, directly or indirectly, or through longer term reimbursement, by Mexico, which has a ridiculous $71 billion dollar trade surplus with the US.

“The $20 billion dollar Wall is 'peanuts' compared to what Mexico makes from the US.

“NAFTA is a bad joke!”

He later moved on to the importance of the wall, claiming it was necessary to protect America.

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Prototype examples of what Donald Trump's border wall may look like

During the US presidential election campaign he said Mexico was not sending “their best” to America and instead letting “bad hombres” cross the border.

He tweeted this afternoon: “We need the Wall for the safety and security of our country. We need the Wall to help stop the massive inflow of drugs from Mexico, now rated the number one most dangerous country in the world.

“If there is no Wall, there is no Deal!”

And in an interview earlier this morning he again threatened to terminate the free trade agreement with Mexico unless he gets his way.

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A Mexican family reunite at a game in an existing wall on the border

He said he knew it would make “a lot of people unhappy” but said it would actually be “good”.

“A lot of people are going to be unhappy if I terminate NAFTA. A lot of people don't realise how good it would be to terminate NAFTA because the way you're going to make the best deal is to terminate NAFTA.